152 MACROCYCLIS. 



shape to the last species; lines of growth distinct, 

 aperture somewhat oblong, with the lips bent near 

 the suture. The color is yellowish green, and the 

 diameter of the largest specimens is nearly an inch, 

 though many are much smaller. The specimens 

 described are from Freeport and Olympia, Wash. Terr. 

 Macrocyclis Vancouver ensis, Lea, Van-cou-ver-en'- 

 sis, Fig. 134. Spire flattened, umbilicus large, aperture 

 nearly straight above, lip sometimes bent downward 

 near the suture. Whorls five, quite 

 smooth and covered with a yellowish 

 green epidermis. Interior of shell white, 

 inner wall of the aperture covered 

 with a thin, white callus. Diameter 

 of shell about one inch, height half as much. It is 

 found from Alaska to San Francisco, also in Idaho 

 and Montana, where the shells are smaller than those 

 on the coast. It is more common in Oregon and 

 Washington Territory. The cut represents a sinistral 

 specimen, but the ordinary form is dextral. 



Macrocyclis Hcmphilli, W. G. Binney, is probably 

 a variety of the last species, smaller and with a nar- 

 rower umbilicus. From the Oregon region. 



Mr. Hemphill is of the opinion that all these 

 examples of Macrocyclis are but varieties of only one 

 species. The animals are snail-like, with long eye- 

 stalks, and are said to be carnivorous. 



Vitrina Pfeiffcri, Newc, Vit-ri'-na Fi'-fer-i, Glass- 

 snail. This little snail, which is found at high alti- 

 tudes in California, Nevada, Utah and New Mexico, 

 has a very thin, depressed shell, consisting of three 

 whorls, of which the last is by far the largest. 

 Aperture very large, oblique, rounded. Nearly trans- 

 parent, greenish white, one-fourth of an inch in 

 diameter. 



